I'm not sure how anyone can claim a particular pair of sunglasses is "best for golf".
If you want a pair that looks good on as well as off the course, I really like my Smith Factor Sunglasses:
http://www.smithoptics.com/Factor_30_38.htmlKey things to look for in sunglasses:
1. Amber or rose tinted lenses are supposedly better for reading greens
2. Make sure you get polycarbonite lenses (glass is heavy and are very dangerous if they shatter)
3. Good coverage so you can look up, down, left, and right while still looking through the lens
4. Adequate curvature of the lens design to eliminate distortion: 9 base lenses great, 8 base lenses work too
As far as polarized vs. non polarized I don't think there is much agreement in terms of golf, so this isn't a priority unless you plan to wear your glasses alot around water. Interchangable lenses are a nice plus too.
You could pay alot for glasses (Kaenon, Oakley, Maui Jim) or a medium amount (Bolle, Smith) or very litte (Tifosi) and all would be great for golf. Alot of it comes down to personal preference and how much you want to spend. The Smith Factors (Dark Ale) aren't too expensive and look great in my opinion.